Nowadays, there are various way in which your android device can be attacked ranging from SMS through MMS,apps,internet browsing and Networks. Giving the fact that our Personal information are stored on this devices, Its Absolute security becomes Extremely important.
Below are the best free and easy to use anti-virus apps for android devices be it an android phone or an Android Tablet.

AVG
This is the most downloaded antivirus apps by android users with over 100 million downloads. This apps is known to kills tasks that slowdown your device, It monitors the use of battery,memory and data. It also helps to locates lost/stolen phone via google maps and immediately locks/wipes device to keep your privacy safe.It automatically scans your devices to defend it against malicious apps,viruses,mal and spyware. Picture of anyone who enter incorrect password on your phone thrice will be taken and it will send it to your email address. It enables you to browse the internet safely and securely. It is available in 20 languages and have a reviews star of 4.4 from more that 1.2 million users. https://play.google.com/store/apps/details?id=com.antivirus&hl=en_GB
AVAST
It also a 4.4 reviews stars by approximately 1 Milion users with about 50 million downloads. It automatically scan installed apps, New apps on first use and memory card content. It scan and remove viruses.It blocks unwanted numbers from reaching you. It blocks Links that are spyware and malware infected and also correct the issues of mistyped URLs for safe web browsing and protect rooted users from hackers. With Avast anti-virus app, you can locate your lost phone using the cell phone locator features and control your android device remotely. Visit http://myavast.com for details. You can also backup contacts,SMS/call logs and photos. https://play.google.com/store/apps/details?id=com.avast.android.mobilesecurity&hl=en_GB
360 SECURITY
This is the next app on this list with a reviews star of 4.5. It terminate unuse apps that are running in the background. It performs virus,vulnerability and trash scan. To free up memory for photos,videos and music, It clear trash files,privacy history and corrupt APKs. It helps to extend battery life when you enable Lock Screen Power-saver mode. Like Avast, it also blocks unwanted calls and SMS. It provide full backup and Scan Installed apps,local APK files in real time. https://play.google.com/store/apps/details?id=com.qihoo.security&hl=en_GB
CM SECURITY
It has a reviews star of 4.7 by over 3 million users. It helps to locate and remotely control lost phones and also deliver the picture of anyone who enter an incorrect password on your device three times. It scanning Takes just 5 secs and fill up small memory. It scan pre-installed and installed apps,thoroughly scan external SD cards to detect and delete threats. Like all other anti-virus apps, CM security also helps to block unwanted calls,malicioius URLs and email you the picture of whoever that enters an incorrect password on your phone three times. https://play.google.com/store/apps/details?id=com.cleanmaster.security&hl=en_GB

Read more: http://www.rasaqtech.com/2014/07/top-four-anti-virus-apps-for-android.html#ixzz37CRAiFVK